How to use multimeter and types of multimeter?

What is a multimeter and how to use it?

Using a multimeter, also known as a multitester or VOM (volt-ohm-milliammeter), is essential for measuring various electrical parameters. Multimeters come in different types, but they generally measure voltage, current, and resistance. Here's a guide on how to use a basic digital multimeter and an overview of common multimeter types:

How to Use a Digital Multimeter (DMM):-

Step 1: Set the Multimeter Function:- Turn on the multimeter and set it to the desired function using the dial. Common functions include voltage (V), current (A), and resistance (Ω).

Step 2: Connect the Test Leads:- For voltage and resistance measurements, connect the red (positive) lead to the "+" socket and the black (negative) lead to the "-" socket. For current measurements, connect the leads according to the specified sockets.

Step 3: Measure Voltage:- To measure DC voltage, set the dial to the V with a straight line (---) symbol. For AC voltage, set it to the V with a wavy line (~) symbol. Touch the red lead to the positive side and the black lead to the negative side of the circuit or component. Read the voltage on the multimeter's display.

Step 4: Measure Current:- To measure current, set the dial to the appropriate current range. In most cases, you need to connect the multimeter in series with the circuit, which means you'll need to break the circuit and insert the multimeter leads. Be careful when measuring current, as this may require higher current settings on the multimeter.

Step 5: Measure Resistance:- Set the dial to the Ω (ohm) setting. Disconnect the component or circuit from the power source and touch the multimeter leads to the component's terminals or across the part you want to measure. The multimeter will display the resistance in ohms.

Step 6: Continuity testing:- For Continuity testing set the dial on continuity 🔈and check sound. This is used for testing broken wire or circuit or simply testing your multimeter leads.

Types of Multimeters: -

1. Analog Multimeter:- Analog multimeters use a needle or pointer to indicate measurements. They are less common today but can be useful for certain applications, especially when monitoring changes over time.

2. Digital Multimeter (DMM):- Digital multimeters display measurements as numerical values on a digital screen. They are more precise and offer various features, including auto-ranging, data hold, and additional functions.

3. Auto-Ranging Multimeter:- Auto-ranging multimeters automatically select the appropriate measurement range, making them user-friendly for those who may not be familiar with the specific measurement range required.

4. Fluke Multimeter:- Fluke is a well-known brand that manufactures high-quality multimeters used in professional and industrial settings. These multimeters often come with advanced features and enhanced durability.

5. Clamp Meter:- A clamp meter, or current clamp, measures current by clamping around a wire without the need to break the circuit. They are particularly useful for measuring current in AC systems.

6. HVAC Multimeter:- HVAC multimeters are designed for use in heating, ventilation, and air conditioning systems. They often include specialized functions for HVAC-related measurements.

7. True RMS Multimeter:- True RMS multimeters provide accurate measurements for both sinusoidal and non-sinusoidal waveforms. They are essential for certain applications with non-standard waveforms.

When using a multimeter, always refer to the manufacturer's instructions and take safety precautions, especially when measuring high voltages or currents. Make sure you understand the settings and ranges on your specific multimeter to obtain accurate measurements and avoid damage to the meter or harm to yourself.